Mind the Buses!!
I first remember my Nan saying it, as an alternative to, 'Take care and mind how you go' on parting, but it soon became the standard departing cry for our whole family.
I said it to someone as they left work one night and they took great umbrage, accusing me of sarcastically wishing them ill will, I hadn't at that point but I soon did ha ha.
Anyhow - I managed to avoid this one - just!